He started using an all natural liquid carbon dioxide dry-cleaning process 10 years ago.

"As long as I was using PERC there was always rumblings as far as getting rid of it, regulating it, or precautions," said Shaw. "I was never really all that crazy about working around it. But it was the tool we used to clean people's clothes."

The EPA estimated the number of machines using wet cleaning and CO2 methods, as Shaw uses, has increased in the past decade.

The EPA said exposure to PERC can occur in the workplace, or in the environment following release to air, water, land, or groundwater.

Exposure also happens to people using products containing PERC, spending time in dry-cleaning facilities that use PERC, living next to dry-cleaning facilities, or bringing dry-cleaned clothes into their homes.

The EPA said once in the body, PERC can remain stored in fat tissue.

The agency said PERC is associated with chronic, non-cancer health effects, including liver and kidney damage in rodents, and neurological effects in humans.

All remaining PERC dry cleaning machines must be removed from service by Jan. 1, 2023.

The California Air Resources Board identified PERC as a toxic air contaminant in 1991.